The article says as much.

> Although this may seem like a significant drawback, it's actually not that alarming, at least not to me. While it's true that you must insert various "move mask to v0" instructions that wouldn't otherwise be there, it's important to remember that these will not really be actual computation instructions. Moves from one vector register to another will always be simple register renames handled by the front end of any high-performance chip, and I would consider it highly unlikely that you would change masks so frequently as to overburden the front end.

This is not the point the author was making.